How do we think the central black hole in the galaxy primarily grew to its current mass?

Question

Quizplus · Accepted Answer

The most widely accepted theory is that the central black hole in a galaxy grew primarily through the process of accretion, or the gradual accumulation of nearby gas. As the gas falls towards the black hole, it forms a disk around it, known as an accretion disk, which becomes heated due to friction and emits radiation. This radiation can be observed by astronomers, and in some cases, it can be used to estimate the mass of the black hole. While other mechanisms such as stellar evolution and supernova explosions may contribute to the growth of the black hole to some extent, they are not believed to be the primary drivers of growth. Similarly, dark matter clumping together is not expected to directly contribute to the growth of the central black hole.

How Do We Think the Central Black Hole in the Galaxy